Definition of pace preposition from the Oxford Advanced American Dictionary

 

pace2

 preposition
preposition
NAmE//ˈpɑtʃeɪ//
 
, NAmE//ˈpɑkeɪ//
 
, NAmE//ˈpeɪsi//
 
(from Latin)(formal)
 
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used before a person's name to express polite disagreement with what they have said The evidence suggests, pace Professor Jones, that… (= Professor Jones has a different opinion). see also pace1
See the Oxford Advanced Learner's Dictionary entry: pace